A gas sensor element (120) configured as a laminate of an oxygen pump cell (135) and an oxygen concentration detection cell (150) with a spacer (145) sandwiched therebetween. The spacer (145) has a gas detecting chamber (145c) formed therein and electrodes (138) and (152) of the cells (135) and (150), respectively, facing the chamber (145c). A leakage section (148) is faces the gas detecting chamber (145c) (measuring chamber).
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January 23, 2015
July 3, 2018
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